Watson-Marlow PD12 IHS - Manual (Page 12)

INSTRUCTION HANDBOOK
PD12IHS / PD12IDH
PD12IHS_PD12IDH IH EN 74-115-181 v2.00.doc Version: 2.00 Page 12 of 19
4.6 Dispensing
4.6.1 Prime tubes
When the tubes and Y-connectors have been assembled and mounted in the dispenser head, the
tubes must be primed; priming tubes have the purpose of filling the tubes with the product.
First, place the product container.
Hold a collecting bowl under the filling nozzle(s) press the prime button.
Check that the tubes are free of bubbles and that the end of the tubes on the suction side, are under
the liquid surface. The suction tubes must not have contact with the container body.
4.6.2 Problems with drips
During filling drips can cause incorrect filling volumes and that the area underneath the filling nozzle
becomes contaminated. If drips occur the following can be tried:
 choose a smaller filling nozzle
 decrease speed
 increase acceleration
 use reversion
 mount a non-return valve
4.6.3 Problems with hard feed
When dispensing with small tubes, counter pressure on the pressure side of dispenser head might
constitute inaccuracy and instability in filling (hard feed). In some cases the problem can be resolved
by using a larger tube on the pressure side (after Y-connector).